i have a 96 f150 xlt 5.0. when i first crank it up sometimes it stumbles like its fuel starved for a few secs. then it runs fine with no problems after its running. iv put new fuel filter, ran injector cleaner thro it. new spark plugs. iv taken off the front fuel tank about 2 yrs ago. im certain the front tank has nothing to do with it..seeing as this problem started just recently. i only use the rear tank. im thinking its the fuel pump... lookin for any other suggestions

 

Cycle your ignition a few time letting the pump prime itself if it takes care of it the pump is getting weak. Also clean your IAC valve that's what controls your idling. Im not sure what the fuel pressure should be for your year but on the earlier 90s models they run 35-45psi also do a leak down test if pressure drops farily quick then the pump is getting weak.